Tuyere block



'Oct. 17, 1933. H. E. PRESTON 1,930,908

TUYERE BLOCK Filed June 21, 1928 mm a Patented Oct. 17, 1933' TUYIJRE BLOCK Herbert E. Preston,. Philadelphia,l ?a., assignor to American Engineering Company, Philadelphia, Pa., a corporation of Pennsylvania Application June. 21,1928. Serial No. 287,277

4 Claims.

My invention relates to tuyeres, and it has for underfeed type. D

Considerable difiiculty and much inconvenience has been occasioned in the use of highly the rear end of the block;,and f Figs. 4 and 5 are longitudinalsectional views,

- tuyre assembly.

preheated air with certain types of tuyres wherein the outlets of the air passages are directly in the beveled side walls of the forward exposed or nose portions of the individual blocks since the molten slag flows through the fuel bed onto the tuyeres and covers the air openings, effectually blocking the passage of air therefrom. The clogging of the air openings results in the rapid heating of the adjacent metal portions ofthe tuyre and subsequently the destruction .of the noses of the tuyere blocks. Another object of.

my invention, therefore, is to provide a stoker tuyere block so constructed as'to overcome these undesirable results.

tion, as well as details of construction and operation thereof, whereby the same may be practiced, will be apparent more fullyhereinafter,

when taken in connection with the accompanybodying my invention; r

Fig. 3 is an end elevational view looking from taken on the lines 4-4 and 5-5, respectively, of Fig. 1, Fig. 4 illustrating by means of broken lines the interrelation'of the tuyre blocks in the Referring to the drawing, the stoker tuyere block therein shown, which is one of a series constituting the tuyre, comprises a main body portion 1 in the form of a flat,- thin plate having a rear portion 2 and a forward portio tuyere the exposed or fuel-supporting section of the block. The portion 2 is provided 'withparallel, longitudinally-extending side edges 4 and '5, while the portion 3 is provided with curved.

side edges 6 and 7 which terminate ina rounded, end edge portion 8. An aperture, 9 is formed in the rear plate portion 2 for the reception .of a

similarly formed projection 11 which depends lug 14 and the centrally positioned end lug 15.

he said. forward portion constituting in t e assembled The tuyre block is supported in position on the next adjacent block of. the series by means of a pair of side projections 13 and 14 and an end projection 15. The undersideslfi of the projections or lugs 13 and 14, and the underside 17 of 0 the end projection or lug 15 are positioned in a common plane and constitute the mainblock-supporting surface. The lug 15, which is positioned in longitudinal alignment with the lug or projection 11, comprisesa depending portion 18 of L- 5 shape.- An aperture 19 is formed in the forward or nose portion 3 of the tuyere block in longitudinal alignment with the lugs 11 and '18, and it is adapted to receive the lug 8 of the next higher v block. The lug 18 of the blockshown in Fig. 2 7 is adapted to enterthe opening 19 of the next lower tuyere block. The lugs-11 and 18 thus assure the locking of each block in position.

Since the underside 12 of the block is spaced .from'the next lower block by means of the lugs 7 Other objects and applications .of my inven- 13, 14 and 15, an air chamber is formed which may be connected inJzhe usual manner with the air box of a stoker (not shown). Inasmuch as it is desirableto cause the air to discharge from the nose 3 in a predetermined manner, a group 20 of fins or ribs 21 are positioned on the underside of the block between the end supporting lug 15 and the side lug 13, while a second group 22' of ribs or fins are positioned between the supporting lug 15 and the side lug '14, as shown in Fig. 1.. The fins 21in the group 20 are formed with a progressively increasing length and decreasing pitch from the side lug 13 to the end lug 15. .The fins 21 in the group 22 are similarly varied in length and pitch between the side 730 Thus, a plurality of channels 23 are formed which progressively increase in length between the side and end ribs in each group, and which in the tuyre assembly constitute the'air passages.

One of the features of my invention is the pro-.- vision of a tuyere, wherein the forward or outlet openings 25 of the air passages 23 are prevented from being blocked by the molten slag passing down through the fuel bed of a furnace. To this end, I provide in 'eachtuyere block a marginal recess 26 which comprises side portions 27 and 28 and an intermediateportion 29. The sideportions 27 and 28'a're coextensive with the inclined edges 6 and 'l of the nose and-are positioned just inwardly of .the same, while the por-' tion 29 is positioned inwardly of the forward edge portion 8. An outer part of the marginal in Fig. 1. A curved overhanging portion 30 is thus formed which in the tuyere assembly is in spaced relation to the upper side of the next lower tuyere, so that a cross channelis provided inwardly of the edges 6, Tand 8 which embraces the entire forward edge of the blockand connects the forwarder discharge ends of the air passages 23.

My invention embodies the still further feature of beveling or inclining the forward ends 31 of I each of the fins 21, as shown in Fig.1, to provide an open space between each of the edge portions 31 and the upper side of the next lower tuyere. These open spaces form in the assembly a marginal or cross air-passage constituting an inner part of the passage 27, and further assure the interconnection of the outlet openings 25 of the air passages 23 in the event that the outer marginal part of the air passage, which is. between the ends of the fins 21 and the edge 6 of the tuyre block, should become obstructed. The length or angle of the beveled portion 31 at the forward end of each fin is progressively decreased in length from the side lug 13 to the end lug 15, thereby providing air outlet openings for the passages 23 which also progressively decrease in length. The rear ends of the fins 21 are also providedwith beveled portions 32 which are opposite to the beveled portions 31 at the forward ends' thereof. The fins 21 in the group 22 are similarly provided with rear beveled portions 33 and forward beveled portions 34, the latter in the assembly forming a cross passage constituting an inner part 35 of the marginal air passage 28. The fins 21 of this group also terminate just inwardly of the side edge '1 to form an outer part 36 of the marginal air passage 28.

An outer part of the intermediate marginal passage 29 is formed by spacing the forward side 37 of the supporting lug 15 from the edge portion 8 to form an overhanging shoulder portion 38. An inner part of the end passage 29 is formed by providing the side 3'7 with a curved portion 39, as shown in Fig. 2. The inner part further decreases the danger of the marginal cross passage-29 being closed by molten slag. Sides 40 and 41 of the lug 15 may also be beveled to assure a desired air distribution.

around the entire forward edge portion of the tuyere nose 3. Should a condition develop wherein the slag completely prevents the passage of air outwardly through the side edge 7, the

edge 8 and all but a portion 46 of the side edge 6 of any of the blocks, the tuyere would still not be damaged, inasmuch as the air passing into the passages 23 of the group 22 circulates through .the marginal recess portions 27, 28 and 26, finally leaving the tuyere through the unobstructed part 46.

While I have shown only one form of embodiment of my invention, for the purpose of describing the same and illustrating its principles of construction and operation, it is apparent that' cated in the appended claims or as are demanded,

by the prior art.

I claim: 1. A tuyere block adapted for arrangement in a stepped series with similar blocks to form tuyeres, said block comprising a plate having a plurality of channel-forming ribs terminating inwardly of the forward edge of the plate and having their forward edges beveled.

2. A tuyre block adapted for arrangement in a stepped series with similar blocks to form tuyeres, said block comprising a plate having a plurality of channel-forming ribs, said ribs having their forward end edges beveled and terminating inwardly of the forward edge of the plate, and said beveled end edges forming acute angles with the plane of the face of said plate from which the ribs project.

3. A tuyere block adapted for arrangement in a stepped series with similar blocks to form tuyeres, said block comprising a plate having parallel straight edge portions, and a curved edge portion connecting said parallel edge portions, a supporting lug on the medial line of the plate, a series of diverging ribson each side of the medial line, the outer ends of said lug and ribs being spaced inwardly from the curved edge of the plate and inclined, said ribs being spaced one from another, and the lug being spaced from the adjacent ribs to form air channels communicating with the space at the outer ends thereof.

4. A tuyere block having a forward substantially horizontal fuel-supporting'portion and a plurality of ribs depending from the underside and forming air channels extending toward the forward edge of said fuel-supporting portion, the 9 forward'ends of said ribs. being beveled downwardly and rearwardly.

HERBERT E. PRESTON. 

